#! /bin/sh
set -eu

usage() {
    printf 'usage: %s [-d <MiB>] 7z-arg ...\n' "$(basename "$0")"
}

for arg in "$@"; do
    if [ "$arg" = -h ] || [ "$arg" = --help ]; then
        usage
        exit 0
    fi
done

if [ "$#" -lt 2 ]; then
    usage >&2
    exit 2
fi

d=1536m
if [ "$1" = -d ]; then
    d=${2%m}m
    shift 2
fi

7z \
    a \
    -t7z \
    -md="$d" \
    -mfb=273 \
    -mlc=0 \
    -mmc=10000 \
    -mmf=bt3 \
    -mmt \
    -mmtf \
    -mpb=0 \
    -ms \
    -mx=9 \
    -myx=9 \
    "$@" \
    ;